This house has GasTite flexable gas lines installed. I asked that the gas line be bonded as required by the manufacturer. This is what I got. It’s bonded to the plastic gas line, but close to the metal gas line.

The code says
A yellow insulated copper tracer wire or other approved conductor shall be installed adjacent to underground nonmetallic piping.
I would assume what is shown below is acceptable. What does “other approved” mean ?